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====== Workaround for getting GLX 1.4 working ======

===== Symptoms =====

  * Gnome-based and other applications report messages like ''"Failed to initialize gtk+: Unable to initialize the Clutter backend: no available drivers found."''
  * ''glxinfo'' reports GLX Version is 1.2
  * Disabling GLX entirely in ''/etc/x2go/x2goagent.options'' via ''-extension GLX'' does not work because the application does not have the capability to work without GLX at all.

===== Approach =====

Use a wrapper/proxy library provided by Mesa. The applications will use the supplied libGL.so, which in turn uses the lib interface to talk to the X server (nxagent) rather than the GLX interface. From the applications' perspective, they have GLX 1.4.


==== Mesa 19 and newer ====
Please note: the instructions below are valid for olter Mesa releases. In Mesa 19 //meson// is recommended for building. Please consult https://mesa3d.org/llvmpipe.html for a basic compilation instruction. Since those instructions will not work out of the box (Error: "gallium-xlib conflicts
with any dri driver") as of Mesa 19.3.2 you need to call //meson// with some further parameters like this:
<code>
$ meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3
$ ninja
</code>

==== Debian Buster and Mesa 19.3.2 ====

<code>
$ (download and extract tarball from mesa3d.org)
$ cd mesa-19.3.2
$ mkdir build
$ cd build
$ meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3
$ ninja
$ LD_LIBRARY_PATH=`pwd`/src/gallium/targets/libgl-xlib/:${LD_LIBRARY_PATH} glxinfo | grep 'GLX version:'
</code>

If you want you can copy the libgl-xlib directory to some location of your likes and write a small wrapper "x2goglx" for starting GLX applications:
<code>
#!/bin/sh
LD_LIBRARY_PATH=<your directory>/libgl-xlib exec "$@"
</code>

<code>
$ chmod u+rx x2goglx
$ x2goglx glxinfo
</code>
==== Ubuntu 14.04 ====

(with trusty-updates mesa 10.1.3-0ubuntu0.3)

<code>
sudo aptitude build-dep mesa
sudo aptitude install scons llvm-dev
apt-get source mesa
cd mesa
scons libgl-xlib
export LD_LIBRARY_PATH=`pwd`/build/linux-x86_64-debug/gallium/targets/libgl-xlib/:${LD_LIBRARY_PATH}
glxinfo | grep 'GLX version:'
</code>

==== Gentoo ====

Ensure that some required tools are installed:

<code>
emerge -1av app-portage/gentoolkit dev-util/scons dev-python/mako
</code>

Create a place to store the library - adapt this path to your liking.
<code>
mkdir -p /usr/local/share/mesa-libgl-xlib
</code>

Place the following line in a suitable place - either in your .bashrc or in the script that calls the individual application:
<code>
export LD_LIBRARY_PATH=/usr/local/share/mesa-libgl-xlib/:${LD_LIBRARY_PATH}
</code>

Configure portage to extract and patch the Mesa package into a known location. Before doing so, ensure that the USE flags for media-libs/mesa are configured to your liking.

<code>
mesa_version="$(equery -q list media-libs/mesa -F '$version')"
ebuild "/usr/portage/media-libs/mesa/mesa-${mesa_version}.ebuild" prepare
</code>

Now compile the library and move it over to the storage location:
<code>
cd "/var/tmp/portage/media-libs/mesa-${mesa_version}/work/mesa-${mesa_version}"
scons libgl-xlib
cp -av build/linux-x86_64-debug/gallium/targets/libgl-xlib/* /usr/local/share/mesa-libgl-xlib/
</code>

Cleanup:

<code>
ebuild "/usr/portage/media-libs/mesa/mesa-${mesa_version}.ebuild" clean
</code>

===== Matlab 2019b =====

To make Matlab load the new driver modify Matlab's lib search path:
cp $MATLAB_DIRECTORY/bin/.matlab7rc.sh ~

Edit the file ~/.matlab7rc.sh, find the glnxa* section and add the path to you mesa library, e.g. /usr/local/mesa-20.1.0/lib/x86_64-linux-gnu, to LDPATH_PREFIX

Add to your .profile: export MESA_GL_VERSION_OVERRIDE=3.0
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